/*
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
 *
 * Copyright (c) 2008-2011, Salzburg Research. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 * - Redistributions of source code must retain the above copyright notice,
 * this list of conditions and the following disclaimer.
 * - Redistributions in binary form must reproduce the above copyright notice,
 * this list of conditions and the following disclaimer in the documentation
 * and/or other materials provided with the distribution.
 * - Neither the name of the KiWi Project nor the names of its contributors
 * may be used to endorse or promote products derived from this software
 * without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 *
 * Contributor(s):
 * sschaffe
 *
 * File Info:
 * User: sschaffe
 * Date: 2011/01/27
 * Time: 15:12
 *
 * Project: KiWi2, kiwi-core module
 */

package kiwi.core.services.io;

import kiwi.core.api.config.ConfigurationService;
import kiwi.core.api.io.KiWiParser;
import kiwi.core.exception.ParsingException;
import org.openrdf.repository.Repository;
import org.openrdf.repository.RepositoryConnection;
import org.openrdf.repository.RepositoryException;
import org.openrdf.repository.sail.SailRepository;
import org.openrdf.rio.RDFFormat;
import org.openrdf.rio.RDFParseException;
import org.openrdf.sail.memory.MemoryStore;
import org.slf4j.Logger;

import javax.inject.Inject;
import java.io.IOException;
import java.io.InputStream;
import java.io.Reader;
import java.io.StringReader;

/**
 * Add file description here!
 * <p/>
 * User: sschaffe
 */
public abstract class GenericSesameParser implements KiWiParser {

    @Inject
    private Logger log;

    @Inject
    private ConfigurationService configurationService;


    private RDFFormat format;


    public GenericSesameParser() {
        this.format = RDFFormat.RDFXML;
    }


    protected GenericSesameParser(RDFFormat format) {
         this.format = format;
    }


    /**
     * Parse the triple data contained in the string passed as argument and return a Sesame in-memory repository for
     * further processing.
     *
     * @param data a string containing the triple data in the format implemented by this parser
     * @return a Sesame in-memory repository containing the parsed triple data
     * @throws kiwi.core.exception.ParsingException
     *          if the string passed as argument does not have the right format
     */
    @Override
    public Repository parseTriples(String data) throws ParsingException {

        try {
            return parseTriples(new StringReader(data));
        } catch (IOException e) {
            log.error("I/O error while trying to read from string, this should never happen",e);
            throw new ParsingException("I/O error while trying to read from string",e);
        }

    }

    /**
     * Parse the triple data contained in the reader passed as argument and return a Sesame in-memory repository for
     * further processing.
     *
     * @param reader a Reader from which the triple data in the format implemented by this parser can be read
     * @return a Sesame in-memory repository containing the parsed triple data
     * @throws kiwi.core.exception.ParsingException
     *          if the data read from the Reader does not have the right format
     */
    @Override
    public Repository parseTriples(Reader reader) throws ParsingException, IOException {
        Repository result = new SailRepository(new MemoryStore());
        RepositoryConnection con = null;
        try {
            result.initialize();
            con = result.getConnection();
            con.add(reader,configurationService.getBaseUri(), RDFFormat.RDFXML);
            con.commit();

        } catch (RepositoryException e) {
            log.error("repository error while establising connection to memory repository, should not happen!",e);
        } catch (RDFParseException e) {
            log.error("error while parsing input data in "+format+" format",e);
            throw new ParsingException("Error while parsing input data in "+format+" format",e);
        }


        return result;
    }

    /**
     * Parse the triple data contained in the reader passed as argument and return a Sesame in-memory repository for
     * further processing.
     *
     * @param in an InputStream from which the triple data in the format implemented by this parser can be read
     * @return a Sesame in-memory repository containing the parsed triple data
     * @throws kiwi.core.exception.ParsingException
     *          if the data read from the stream does not have the right format
     */
    @Override
    public Repository parseTriples(InputStream in) throws ParsingException, IOException {
        Repository result = new SailRepository(new MemoryStore());
        RepositoryConnection con = null;
        try {
            result.initialize();
            con = result.getConnection();
            con.add(in,configurationService.getBaseUri(), format);
            con.commit();

        } catch (RepositoryException e) {
            log.error("repository error while establising connection to memory repository, should not happen!",e);
        } catch (RDFParseException e) {
            log.error("error while parsing input data in "+format+" format",e);
            throw new ParsingException("Error while parsing input data in "+format+" format",e);
        }

        return result;
    }


}
